2308-900-01 Rev. A / July 2008
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Section Topics
6-7
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 6: GPIB Operation
Remote indicator and LOCAL key
When the power supply is in the remote state, the “R” character is displayed in the bottom right
corner of the display. It blinks as a solid block character. “R” does not necessarily indicate the state
of the REM line, as the instrument must be addressed to listen with REM true before the “R”
indicator turns on.
When the instrument is in the remote state, all front-panel keys, except for the LOCAL key, are
locked out. The LOCAL key cancels the remote state and restores local operation of the
instrument. Pressing the LOCAL key also turns off the “R” indicator and returns the display to
normal if a user-defined message was displayed.
If the LLO (local lockout) command is in effect, the LOCAL key is also inoperative.
Error and status messages
See
Appendix A
for a list of error and status messages associated with IEEE-488 programming.
The instrument can be programmed to generate an SRQ, and command queries can be
performed to check for specific error conditions.
Programming syntax
The information in the following paragraphs covers syntax for both common commands and SCPI
commands. For information not covered here, refer to
Section 8
for common commands or to
Section 11
for SCPI commands. Also refer the IEEE-488.2 and SCPI standards.
Command words
Program messages are made up of one or more command words and parameters.
Commands and command parameters
Common commands and SCPI commands may or may not use a parameter. The following are
some examples:
*SAV <NRf>
Parameter (NRf) required
*RST
No parameter used
:DISPlay:TEXT:STATe <b>
Parameter <b> required
:STATus:PRESet
No parameter used.
Put at least one space between the command word and the parameter.
Brackets [ ] - Some command words are enclosed in brackets ([ ]). These brackets are used to
denote an optional command word that does not need to be included in the program message. For
example:
:FORMat[:DATA]?
These brackets indicate that
:DATA
is implied (optional) and does not have to be used. Thus, the
above command can be sent as
:FORMat?
or
:FORMat:DATA?
.
Notice that the optional command is used without the brackets. When using optional command
words in your program, do not include the brackets.
Parameter types - The following are some of the more common parameter types:
• <b>
Boolean - Used to enable or disable an instrument operation. 0 or OFF disables the
operation, and 1 or ON enables the operation.
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